Hi Giacomo Miliorini,
Check the userexits 1.USEREXIT_ACCOUNT_PREP_KOMKCV(Module Spool SAPLV60A, Program RV60AFZZ)
2.USEREXIT_ACCOUNT_PREP_KOMPCV(Module Spool SAPLV60A)
Also check the Define Dependencies of Revenue account determination in SPRO. Check the allowed fields for tables.
Regards,
S.Himavanth.
